MDI Basic G-Code for Calibration

What am I missing here?

I have been trying to roughly follow the procedures for belt stretch calibration and when I type the command “G0X-125F100” I am running almost 540mm to the right. I have a fleeting suspicion that I am somehow running 125 steps not 125 mm. PLEASE use plain language as I am not familiar with G-Code.

Command for running:
Z up:
Z down:
X front:
X Back:
Y Front:
Y Back:

As always Thanks ahead of time for taking time to help out.

@mikep Link to above-referenced calibration.

Most likely, your zero is set so that your current zero is ~665mm to the left of zero — G-Code is by default, absolute, so start with:

G0 X0 Y0 Z0

that will move the machine to where it thinks home is.

At this point, a movement:

G0 X-125

should move 125mm to the left (the F is not needed G0 is rapid at the Grbl setting for rapid movements)

If that doesn’t yield the desired results, start by making sure you’ve sent the correct machine configuration:

If none of the above works out, break down what you’re doing step-by-step so that we can recreate everything:

  • what you did
  • what you expected
  • what actually happened

covering every step from the beginning.


This was exactly what I needed. The very basic aspect of G0 X0 Y0 Z0 via the MDI tab is a basic that I missed or forgot somehow. Also, the code correction that you suggested worked a charm.

Now let’s do some calibrating :large_blue_diamond:

@WillAdams always appreciated.


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